Baby chicks are like human infants in that they chirp/cry non-stop when they are in distress.
Your chick has something wrong, and it is trying to let you know. You need to be an investigator. Some times a chick learns to peep until its human comes and gives it some attention, But if that's the reason, it will stop when it sees you.
Could it be constipated? Is it pooping? Is it eating? Is it drinking? It may even have an infection.
Is your brooder large enough for all the chicks to move freely in and out of the heated zone, or is the brooder too crowded? This chicks may be either too hot or too cold. You need to figure out which.
We aren't there. You are. Check the chick's butt for pasty butt and clean it if it's pasted over with poop. If it's not pooping, you may need to get some mineral oil into it.
Take these as a starting point, and see if you can figure out why your chick is in distress, if it is.